MockTreeBranch mockBranch = new MockTreeBranch();
mockBranch.addPart(mockBranchPart);
MockTree mockTree = new MockTree();
mockTree.addBranch(mockBranch);
TreeGrowth treeGrowth = new TreeGrowth(UtilDataCreatorForTests.createSpecificConditionalTaskState(), mockTree);
treeGrowth.executeConditionalStep();
assertEquals(1, mockLeaf.getNbImproveEfficiencyCalled());